i just have one big complaint.... could you try and make the "Canvas" smaller? (select the sprite and move it to the upper left corner, then click the blue dot in the lower right and drag it up and left

but yeah... mostly just shading and maybe try not to use such a bright red *coughlatioscough*

also, I'm gonna steal Nabeel's job... Color Teh Outlines Pleese!!! :p

(of the Rays, the blue one looks best... you missed some shades on the red one...)